Abstract: An oil composition containing a hydrogenated radial polymer having three rubbery diene arms and one block copolymer arm having a terminal resinous block is provided. It has been found that these asymmetric radial components impart a disproportionately good high temperature/high shear rate viscosity, thus enhancing oil performance under the severe conditions encountered in many modern internal combustion engines.

Abstract: Star polymers having first polymeric arms comprising a hydrogenated conjugated diene and smaller second polymeric arms of a methacrylate resist coupling of methacrylate blocks attached to different cores and have improved performance as viscosity index improvers. The polymerized methacrylate units are converted to amide or imide groups by reaction with a primary or secondary amine to give the viscosity index improver dispersant properties.

Abstract: Star polymers having polymeric arms of a hydrogenated conjugated diene and substantially smaller polymeric arms of an alkyl methacrylate are efficiently reacted with amines after preparation of a concentrate of the polymer in a lubricating oil to form a dispersant viscosity index improver.

Abstract: An epoxidized diene star polymer having greater than 4 arms and comprising from 0.05 to 5 Meq of di-, tri- and tetra-substituted olefinic epoxides and the molecular weights of the arms are from 1,500 to 15,000.

Abstract: The present invention provides grafted polymers that have pendent functional groups on the core of the polymer wherein the core is a polymerized alkylmethacrylate having a number average molecular weight from 500 to 1,000,000. The arms of the grafted polymer comprise anionically polymerized segments that have number average molecular weights from 1,000 to 300,000.

Abstract: A processor is provided (FIG. 1) comprising a plurality of processing elements (10) arranged into D dimensions and divided into clusters (11), wherein all elements in a cluster have a bus (13) for communicating therebetween. Each element is a member of one cluster in each dimension. Each element in a cluster is connected to the bus in that cluster by output means (FIG. 3), for sending messages to a plurality of other elements in the cluster, and separate input means corresponding to each other element in the cluster for receiving messages from each other element on the corresponding separate input means.

Abstract: An engine oil formulation comprising of a pour point depressant, a dispersant inhibitor package containing a reduced amount of ashless dispersant, a synthetic or mineral based oil or mixtures thereof, and a modified hydrogenated star polymer of a conjugated diolefin and a modified hydrogenated copolymer of conjugated diolefins and monoalkenyl arenes is disclosed. The engine oil has and exhibits improved dispersancy and rheological properties which is attributable to the presence therein of the modified hydrogenated star polymer of a conjugated diolefin and a modified hydrogenated copolymer of conjugated diolefins and monoalkenyl arenes. A process of producing the inventive engine oil composition is also disclosed.

Abstract: Star polymers having first polymeric arms comprising a hydrogenated conjugated diene and smaller second polymeric arms of a methacrylate resist coupling of methacrylate blocks attached to different cores and have improved performance as viscosity index improvers. The polymerized methacrylate units are converted to amide or imide groups by reaction with a primary or secondary amine to give the viscosity index improver dispersant properties.

Abstract: Polymers comprising anionically polymerized conjugated dienes or vinylarenes and adjacent units of (1-methyl-1-alkyl)alkyl esters such as t-butylmethacrylate or (1-aryl-1-alkyl)alkyl esters, as well as selectively hydrogenated derivatives thereof, are heated to at least 170.degree. C. in the presence of an amine to convert the polymerized ester to amide and imide groups.

Abstract: Polymers comprising blocks of a hydrogenated conjugated diene (B), a vinylarene (A), and an alkyl methacrylate (M), are readily prepared as a mixture of molecules having the structures B-A-M and B-A-M-A-B wherein both structures are effective as viscosity index improvers for oil compositions. Reaction of the polymers with a primary or secondary amine results in a dispersant viscosity index improver.

Abstract: An epoxidized diene star polymer having greater than 4 arms and comprising from 0.05 to 5 Meq of di-, tri- and tetra-substituted olefinic epoxides and the molecular weights of the arms are from 1,500 to 15,000.

Abstract: A coil is constructed such as that required in NMR imaging apparatus and in some NMR analytical applications, gradients can be established on selected axes within a uniform magnetic field. The windings of the coil also constitute an electrostatic screen which isolates the high-frequency coupling coil from the sample. The coil comprises a pair of similar quadrupole windings uniformly interpolated on the circumference of a cylindrical surface which encloses the sample volume. The winding of each pole includes conductors lying longitudinally on the cylindrical surface and distributed symmetrically over a quadrant of the circumference, the number of conductors per radian being proportional to cos 2.theta. where .theta. is the displacement from the center of the quadrant. Adjacent pole windings belonging to different quadrupoles thus overlap and the winding density is chosen so that the outer conductors of the two windings can be interlaid to form an effectively continuous electrostatic screen.

Abstract: A method of deriving image formation from an object using nuclear magnetic resonance signals comprises the steps of subjecting an object to a static magnetic field along one axis, applying a first gradient to said magnetic field which varies in a direction orthogonal to said axis together with a 90.degree. high frequency pulse, reversing the direction of said magnetic field gradient and simultaneously applying a gradient to said magnetic field which varies in a direction parallel to said one axis and then reversing the direction of said last-mentioned gradient and reading out the free induction signal from said object.